git grep does not find all occurrences on macOS

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Hi!

I encountered rather subtle issue on in git 2.47.0 on macOS 14.7 (installed from Homebrew):

git grep will not find all occurrences of string patterns containing a “.” under some
conditions. In my case I have an ISO-8859 encoded text file which contains umlauts.
If the string I’m grepping for occurs after a non-ASCII character in this file, git grep
will not find it.

I’ve put up a reproducer here https://github.com/iokill/repro-git-grep-issue, but the gist
of it is "git grep quz.baz" on the ISO-8859-encoded file below will not return anything,
when it should return the line "quz.baz=3":

-->8-------------
foo=bar
umlauts=äöü
quz.baz=3 
--8<-------------


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